From Equilibrium to Steady State: The Transient Dynamics of Colloidal Liquids under Shear
Zausch, J. and Horbach, J. and Laurati, M. and Egelhaaf, S. U. and Brader, J. M. and Voigtmann, T. and Fuchs, M. (2008) From Equilibrium to Steady State: The Transient Dynamics of Colloidal Liquids under Shear. Journal of Physics - Condensed Matter, 20, . DOI: 10.1088/0953-8984/20/40/404210.
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We investigate stresses and particle motion during the start up of flow in a colloidal dispersion close to arrest into a glassy state. A combination of molecular dynamics simulation, mode coupling theory and confocal microscopy experiment is used to investigate the origins of the widely observed stress overshoot and (previously not reported) super-diffusive motion in the transient dynamics. A link between the macro-rheological stress versus strain curves and the microscopic particle motion is established. Negative correlations in the transient auto-correlation function of the potential stresses are found responsible for both phenomena, and arise even for homogeneous flows and almost Gaussian particle displacements.
|Title:||From Equilibrium to Steady State: The Transient Dynamics of Colloidal Liquids under Shear|
|Journal or Publication Title:||Journal of Physics - Condensed Matter|
|In ISI Web of Science:||Yes|
|Keywords:||molecular dynamics, glass forming liquids under shear, confocal microscopy, mode coupling serie|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Materialwissenschaftliche Forschung (old)|
|Institutes and Institutions:||Institute of Materials Physics in Space|
|Deposited By:||Ingeborg Parpart|
|Deposited On:||21 Oct 2008|
|Last Modified:||27 Apr 2009 15:08|
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